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Revert "Revert "ACPI: CPPC: Use access_width over bit_width for system memory accesses""

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This reverts commit b54c4632946ae42f2b39ed38abd909bbf78cbcc2 which was a
revert of a backport of commit 2f4a4d63a193be6fd530d180bb13c3592052904c
upstream to 5.15.y.

Cc: Jarred White <jarredwhite@linux.microsoft.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Vanshidhar Konda <vanshikonda@os.amperecomputing.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Easwar Hariharan 2024-05-09 19:41:24 +00:00 committed by Greg Kroah-Hartman
parent 3c7013a871
commit 6dfd79ed04
1 changed files with 24 additions and 3 deletions
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27
drivers/acpi/cppc_acpi.c
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@ -161,6 +161,13 @@ show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_freq);
show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, reference_perf);
show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, wraparound_time);
/* Check for valid access_width, otherwise, fallback to using bit_width */
#define GET_BIT_WIDTH(reg) ((reg)->access_width ? (8 << ((reg)->access_width - 1)) : (reg)->bit_width)
/* Shift and apply the mask for CPC reads/writes */
#define MASK_VAL(reg, val) ((val) >> ((reg)->bit_offset & \
GENMASK(((reg)->bit_width), 0)))
static ssize_t show_feedback_ctrs(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@ -762,8 +769,10 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
} else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
if (gas_t->address) {
void __iomem *addr;
size_t access_width;
addr = ioremap(gas_t->address, gas_t->bit_width/8);
access_width = GET_BIT_WIDTH(gas_t) / 8;
addr = ioremap(gas_t->address, access_width);
if (!addr)
goto out_free;
cpc_ptr->cpc_regs[i-2].sys_mem_vaddr = addr;
@ -936,6 +945,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
{
int ret_val = 0;
void __iomem *vaddr = NULL;
int size;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = &reg_res->cpc_entry.reg;
@ -955,7 +965,9 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
return acpi_os_read_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
switch (reg->bit_width) {
size = GET_BIT_WIDTH(reg);
switch (size) {
case 8:
*val = readb_relaxed(vaddr);
break;
@ -974,12 +986,16 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
ret_val = -EFAULT;
}
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
*val = MASK_VAL(reg, *val);
return ret_val;
}
static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
{
int ret_val = 0;
int size;
void __iomem *vaddr = NULL;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = &reg_res->cpc_entry.reg;
@ -994,7 +1010,12 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
return acpi_os_write_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
switch (reg->bit_width) {
size = GET_BIT_WIDTH(reg);
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
val = MASK_VAL(reg, val);
switch (size) {
case 8:
writeb_relaxed(val, vaddr);
break;